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. nasa turned to solar cells as a sourt of power for the satellites. at the time they cost literally hundreds of dollars per watt. nasa didn't care, right? >> it's nasa. >> over the last decades the cost of solar cells has come down and down and down. the efficiency, the conversion efficiency has continued to go up and up and up, right? now you've got solar cells that are produced for under a dollar a watt. just in the last few years they came down a factor of three thanks to the chinese that ramped up production and made 50% of it. >> put some numbers around. this the price of solar panels have come down 46% since the first quarter of 2010. >> that's crazy. >> it's incredible. >> i'm glad that you cued up the international discussion. there's a lot of exciting stuff happening internationally. it's important for americans to hear this can be done. it doesn't have to be this sort of after thought welfare case. it can be integrated into how a nation gets its power. more on that after this break. >>> in germany right now there's been a real revolutionary transformation of the grid there
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